Hide then Show again, animation no longer works

[Gwunhar]

I'm setting an Image visible when I launch a background worker and using an animated gif in it and hiding it when the work completes. It works great the first time through, but if I click the "do work" button again when the image is set visible again the animation doesn't work. The only remarkable thing I'm doing in between is re-setting the UriSource of the image.

Is this a bug or am I doing something wrong?

[thomaslevesque]

Hi @Gwunhar,

I'm not sure... Could you show some of the code?

[Gwunhar]

Sorry for the delayed response!

So on button click I pick a random gif to show while I go do work on a background worker:

Random rdm = new Random();
int pic = rdm.Next(1, 30);
var image = new BitmapImage();
image.BeginInit();
if (pic >= 1 && pic <= 10)
{ image.UriSource = new Uri("/Images/Corgi Treadmill.gif", UriKind.Relative); }
else if (pic >= 11 && pic <= 20)
{ image.UriSource = new Uri("/Images/Pug Couch.gif", UriKind.Relative); }
else if (pic >= 21 && pic <= 30)
{ image.UriSource = new Uri("/Images/Pug Stairs.gif", UriKind.Relative); }
image.EndInit();
ImageBehavior.SetAnimatedSource(imgWorking, image);
ImageBehavior.SetAutoStart(imgWorking, true);
ImageBehavior.SetRepeatBehavior(imgWorking, RepeatBehavior.Forever);

cOverflow.Visibility = Visibility.Visible;
imgWorking.Visibility = Visibility.Visible;
//throw a background worker here

Which works perfectly and the team gets to watch doggies while their files are being made. And when the worker completes I do this

imgWorking.Visibility = Visibility.Hidden;
MessageBox.Show("Production complete!", "Production complete", MessageBoxButton.OK, MessageBoxImage.Information);
tbJobNumber.IsEnabled = true;
btnMakeProduction.IsEnabled = true;
btnRefresh.IsEnabled = true;
btnSetSimplex.IsEnabled = true;
cOverflow.Visibility = Visibility.Hidden;

And everything's good.

However, if I immediately click the same "do work" button again I'll get a static display of whichever gif gets picked instead of an animated one.

[thomaslevesque]

Hi @Gwunhar,

Thanks for the details. This looks like a bug in the way relative URIs are handled. I have a fix coming, but in the meantime you can use absolute URIs as a workaround (e.g. pack://application:,,,/Images/Corgi Treadmill.gif).

[thomaslevesque]

@Gwunhar, the bug is fixed in 1.4.17 https://www.nuget.org/packages/WpfAnimatedGif/1.4.17

[Gwunhar]

Thanks for the quick response and fix! I tested it and it's working perfectly.